Related for Megillah 53:16
ת"ר לא ימכור אדם ס"ת אע"פ שאינו צריך לו יתר על כן ארשב"ג אפי' אין לו מה יאכל ומכר ס"ת או בתו אינו רואה סימן ברכה לעולם:
Our rabbis taught: One should not sell a Sefer Torah even though he does not need it. Rabban Shimon b. Gamaliel went further and said: Even if a man has no food and he sells a Sefer Torah or his daughter, he will never have any luck [from that money]
Tosefta Bikkurim
One who sells a Torah scroll will never see a sign of blessing (i.e., he will not benefit from the sale). One who writes scrolls for tefillin and mezuzot -- they and their merchants, and the merchants' merchants (i.e., the wholesalers), and all that occupy themselves not for the sake of Heaven, they will never see a sign of blessing. If they occupy themselves for the sake of Heaven, behold, they will receive every blessing. Merchants [who sell produce] in the sabbatical year, and those who grow small livestock, and those who chop down good trees, they will never see the sign of blessing of the Most High. [But] if they occupied themselves for the sake of Heaven, behold, they will receive every blessing.
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